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The end-Cretaceous event is the only mass extinction definitively known to be associated with an impact, and other large extraterrestrial impacts, such as the Manicouagan Reservoir impact, do not coincide with any noticeable extinction events. [249]
The end of the Cretaceous is defined by the abrupt Cretaceous–Paleogene boundary (K–Pg boundary), a geologic signature associated with the mass extinction that lies between the Mesozoic and Cenozoic Eras.
The end-Cretaceous mass extinction removed the non-avian dinosaurs and made it possible for mammals to expand into the large terrestrial vertebrate niches. The dinosaurs themselves had been beneficiaries of a previous mass extinction, the end-Triassic, which eliminated most of their chief rivals, the crurotarsans.
By the time the Cretaceous-Paleogene, or K/Pg, extinction event was over, about three-quarters of species alive at the time of impact had disappeared forever.
The Cretaceous–Paleogene extinction event (formerly known as the Cretaceous–Tertiary extinction event) [a] occurred at the end of this age. [3] In this mass extinction , many commonly recognized groups such as non-avian dinosaurs , plesiosaurs and mosasaurs , as well as many other lesser-known groups, died out.
But the end-Cretaceous extinction is the only one reliably associated with an asteroid, according to Benton. A different culprit, however, does explain several smaller extinction episodes and at ...
A conference dedicated to the end-Cretaceous extinction event was held in Houston, Texas. [45] During the conference several expert attendees embarked on a field trip to the Mexican Arroyo el Mimbral site to assess whether or not the deposit formed rapidly, as in the tsunami hypothesis or gradually as in the sedimentary slumping hypothesis. [109]
Cretaceous: Cretaceous–Paleogene extinction event: 66 Ma Chicxulub impactor; ... End-Ediacaran extinction: 542 Ma: Anoxic event [45] Great Oxygenation Event: 2400 Ma: